Remember the last time you've been working on a map or a persona, and, all of a sudden, you delete the wrong piece of content or just do something you didn't mean to? Is there a way to revert the changes and not lose the work you've already done?

With the Undo / Redo option, you can revert or bring back the changes that need to stay. The option is applicable to personas, journey maps, and impact maps, and works on every action: adding or removing a stage or a section, changing the background color of a tile, etc.
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The Undo and Redo buttons are located in the upper menu:

There are no limits to Undo / Redo within a single session. But once you switch to a different map or persona, you cannot revert the changes in the previous document.